Absolutely true, ROI is a long shot in your case as with me , will be using only in summer. Also, is the Sharp One Inverter AC? i mean all ACs have Inverters right? its only the DC one's that are the power saving ones if i'm not wrong?Any reason for not going for inverter ac. I was also looking for 1 T AC and my usage will be less. Bangalore temp is not that bad. Will use it for 8 hrs/day for 3-4 months. i saw few of them recommend Sharp AH-XP13LV. Not sure if the initial investment is worth the power saving in my case.